Francis winters



F. WINTERS, Jr.

Electric-Lamp.

No. 223,790. Patented .lan.- 20, 1880.

INVENTOR.

Wnmessas N. PETERS. FHOTO-LITHQGRAPHER. WASHINGTON D c.

UNITED STATES PATENT OFFICE.

FRANCIS WINTERS, JR, OF NEW YORK, N. Y.

ELECTRIC LAMP.

SPECIFICATION forming part To all whom it may concern Be it known thatI, FRANCIS WVINTERs, J r., of New York city, have invented a new anduseful Improvement in Electric Lamps, of which the following is aspecification.

My invention relates to a certain improvement in that class of electriclamps in which a current of air is caused to circulate between thecarbons, so as to insulate the same and maintain the electric are at thetop of the carbons, the object of my invention being to so construct andarrange the carbons and their holder that the current of air will becaused to pass between the carbons without the aid of any chimney orother outside means of inducing draft.

This object I attain in the manner which I will now proceed to describe,reference being had to theaoeompanying drawings, in which Figure 1 is avertical section of a lamp constructed according to my invention, andFig. 2 a sectional plan on the line 1 2.

Ais the positive, and B the negative, carbon, both of which are in thepresent instance tubular, arranged concentrically one within the other,and of such relative diameter that an annular space, a, shall intervenebetween the two carbons.

D is the holder for the carbon A, and E the holder for the carbon B,these holders being likewise tubular, and being insulated from eachother by an annular block, I), of glass, rubber, or other suitablematerial.

X is the negative, andythe positive, wire of a suitable battery ormagnetoelectric machine, the wire X being connected to the holder E, andthe wire y being connected to an arm, (I, which projects from the holderD, and has flanges c c, by which itmay be secured to any suitablesupport.

of Letters Patent No. 223,790, dated January 20, 1880.

Application filed March 26, 1879.

In the holder D are formed a series of open- 'ings, i, through which airgains free access to the annular space a between the carbons A and B,the air being relied upon as the medium for insulating the carbons fromeach other, and for maintaining the electric arc in its proper positionat the top of the carbons. The central opening of the inner or negativecarbon, B, is also supplied with air through opcnin gs m in the lowerportion of the holder E; but this is not essential, as said inner carbon may, if desired, consist of a solid rod instead of being tubular.The tubular carbon is preferred, however, as it affords a means ofsupplying air to the light at a point which could not be reached shouldthe inner carbon be solid.

The proper proportions of the carbons in respect to each other willdepend upon whether a continuous currentor reversed currents are reliedupon to maintain the light.

I do not desire to claim, broadly, insulating the carbons andmaintaining the are at the top of the same by means of a current of airpassing between the carbons; but

I claim as my invention- The combination of the inner carbon, B, theouter tubular carbon, A, and the holder D, all arranged substantially asset forth, so that an annular space, a, open to the air at the lowerend, will intervene between the two carbons, all substantially as setforth.

In testimony whereofIhave signed my name to this specification in thepresence of two subscribing witnesses.

FRANCIS -IVINIERS, JR.

